JP2003025110A - Surface coated cemented carbide cutting tool excellent in surface lubricity for cutting chip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface coated cemented carbide cutting tool excellent in surface lubricity for cutting chips. SOLUTION: This cutting tool comprises a lubrication coated layer deposited physically on the surface of a tool base body comprising tungsten carbide base cemented carbide alloy or titanium carbonitride base cermet. This surface lubrication coated layer comprises (a) a hard coat layer comprising a compound nitride layer and/or a compound carbonitride layer of Ti and Al expressed by a composition formula, (Ti1- XAlX)N and (Ti1- XAlX)C1- YNY (X: 0.1 to 0.7, Y: 0.5 to 0.99), (b) an intermediate closely contact coated layer comprising one kind or two or more kinds of layer out of a compound carboxide layer and a compound carbonitroxide layer of Ti and Al expressed by a composition formula, (Ti1-a Ala )C1-b Ob and (Ti1-a Ala )C1-(b+c) Ob Nc (a: 0.1 to 0.7, b: 0.1 to 0.8, c: 0.05 to 0.65), and (c) a compound oxide layer of Zr and M expressed by a composition formula (Zr1-m Mm )On (m: 0.01 to 0.1 and n: 1.7 to 2.3).

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an excellent surface lubricating property against chips, and therefore, is particularly highly viscous, such as stainless steel or mild steel, and the chips have a cutting edge surface. Excellent cutting performance without chipping or chipping (small chipping) of the cutting edge when using high-speed cutting of difficult-to-cut materials that are easily welded to heavy metals, especially under heavy cutting conditions such as high cutting depth and high feed The present invention relates to a surface-coated cemented carbide cutting tool (hereinafter, referred to as a coated cemented carbide tool) that is exerted over a long period of time. 2. Description of the Related Art In general, a coated carbide tool is a throw-away tip which is removably attached to the tip of a cutting tool for turning or planing a work material such as steel or cast iron. Drills and miniature drills used for drilling and cutting of the work material, and solid type end mills used for face milling and grooving of the work material, shoulder processing, and the like. A throw-away end mill tool or the like which detachably attaches and performs cutting in the same manner as the solid type end mill is known. [0003] Further, the above-mentioned coated cemented carbide tool generally uses, for example, an arc ion plating apparatus which is a kind of a physical vapor deposition apparatus schematically shown in FIG. An arc discharge is caused between the anode electrode and a cathode electrode (evaporation source) on which a Ti-Al alloy having a predetermined composition is set while being heated to a temperature of 500 ° C. under a vacuum of 1.3 × 10 ⁻³ Pa. Raises
At the same time, methane gas and / or nitrogen gas are introduced into the apparatus as a reaction gas, while tungsten carbide (hereinafter, W)
C) based cemented carbide or titanium carbonitride (hereinafter referred to as Ti
For example, a bias voltage of -120 V is applied to a tool base (hereinafter, referred to as a super hard base) made of a base cermet (indicated by CN) and opposed to the anode electrode and the cathode electrode at a predetermined interval. Under the conditions applied, the surface of the cemented carbide substrate is coated, for example, as disclosed in
No. 6,565, the composition formula: (Ti
_1-X Al _x ) N and (Ti _1-x Al _x ) C _{1-Y NY} , the center of the cross section in the thickness direction was measured with a scanning electron microscope, and the atomic ratio was X: 0.1-0.7, Y: 0.5-
0.99 that satisfies 0.99.
One of a (Ti, Al) N] layer and a composite carbonitride [hereinafter, (Ti, Al) CN] layer;
Alternatively, it is also known to be manufactured by physical vapor deposition of a hard coating layer composed of both with an average layer thickness of 0.5 to 15 μm. [0004] In recent years, the use of FA in cutting equipment has been remarkable. On the other hand, there has been a strong demand for labor saving, energy saving, and further cost reduction for cutting work. In addition to the need for versatility to cut as many types of work materials as possible with a single type of tool, cutting tends to be faster, but in the above-mentioned conventional coated carbide tools, There is no problem when used for cutting under ordinary conditions such as steel or cast iron, but when used for high-speed cutting of work materials such as extremely viscous stainless steel and mild steel, The swarf of the material is composed of the (Ti, Al) N layer and the (Ti, Al)
Due to the high affinity for the CN layer, it is easily welded to the cutting blade surface, and this welding phenomenon causes chipping or chipping of the cutting blade, resulting in a relatively short service life. [0005] Accordingly, the present inventors have proposed:
From the above-mentioned viewpoints, a study was conducted to develop a coated carbide tool in which cutting chips are hardly welded to the surface of the cutting edge even when used for cutting of stainless steel, mild steel, and the like.
As a surface coating layer on the surface of the conventional coated carbide tool,
Composition _{formula: (Zr 1- m M m)} O n ( however, M is Ti, V,
Nb, and one or more of Ta) are represented by the following formula: m: 0.01 to 0.1, n: 1.7 to 2.3, a composite oxide of Zr and M [hereinafter (Zr, M) O
The layer is physically vapor-deposited with an average layer thickness of 0.5 to 15 μm, and the resulting (Zr, M) O layer is physically vapor-deposited on the surface of the ordinary hard coating layer as a surface coating layer. In a cemented carbide tool, the surface coating layer is formed (Z
The (r, M) O layer has a very low affinity for a work material, particularly a high-viscosity hard-to-cut material such as stainless steel or mild steel, and as a result, no chips are welded to the cutting edge, that is, (Zr, M) Since the O layer exhibits excellent surface lubricity, chipping and chipping do not occur on the cutting edge, and excellent cutting performance is exhibited over a long period of time. (B) The (Zr, M) O layer formed by the above physical vapor deposition method is composed of a (Ti, Al) N layer and a (Ti, Al) CN layer which are hard coating layers constituting a coating layer. In the coated carbide cutting tool in which the (Zr, M) O layer is directly formed on the surface of the above-mentioned conventional coated carbide cutting tool, a high load is applied particularly to the tool cutting edge because the adhesiveness of the tool is not sufficient. When performing high-speed cutting of stainless steel or mild steel under heavy cutting conditions such as high depth of cut or high feed, the above (Zr, M)
The O layer is easily peeled. (C) First, on the surface of the hard coating layer composed of the (Ti, Al) N layer and the (Ti, Al) CN layer constituting the above-mentioned conventional coated carbide cutting tool, a composition formula: (Ti _{1− a
Al a) C 1-b O} b and the _{(Ti 1-a Al a)} C 1- (b + c) O
When expressed in _b N _c, the cross section in the thickness direction central portion as measured with a scanning electron microscope, a: 0.1~0.7, b: 0.1~0.8 , c: 0.05~ A composite carbonate of Ti and Al satisfying 0.65 [hereinafter, (Ti,
Al) CO] layer and / or a composite carbonitride of Ti and Al [hereinafter referred to as (Ti, Al) CNO] layer is physically vapor-deposited, and the (Zr, M) O layer is Upon evaporation, the resulting (Zr, M) O layer would have the (Ti,
Al) CO layer and (Ti, Al) CNO layer are extremely firmly adhered, and the (Ti, Al) CO layer and (T
Since the (i, Al) CNO layer has excellent adhesion to the hard coating layer composed of the (Ti, Al) N layer and the (Ti, Al) CN layer, In the coating layer, the (Ti, Al) CO
Through the layer and the (Ti, Al) CNO layer.
M) A coated carbide cutting tool formed by physical vapor deposition of an O layer can perform high-speed cutting of stainless steel, mild steel, and the like, even under heavy cutting conditions such as high cutting and high feed, in which a high load is applied to the tool cutting edge. The (Zr, M) O layer exhibits excellent abrasion resistance over a long period of time without peeling. The research results shown in (a) to (c) above were obtained. The present invention has been made based on the results of the above-mentioned research, and comprises: (a) a composition formula: (Ti _1-X Al _X ) N and (Ti _1-X)
Al _x ) C _{1-Y NY When} measured in the thickness direction at the center of the cross section in the thickness direction using an Auger spectrometer, the following are all expressed by atomic ratios: X: 0.1 to 0.7, Y: 0 (Ti, Al) N layer and (Ti, Al) C
One or both of the N layers;
Hard layer having an average layer thickness of 5 to 15 [mu] m, (b) the composition _{formula: (Ti 1-a Al a} ) C 1-b O b and the (Ti _1-a A
l _a ) When represented by C _{1-(b + c)} O _b N _c , the center of the cross section in the thickness direction was measured by an Auger spectroscopic analyzer, and a: 0.1 to 0.7; (Ti, Al) CO layer and (Ti, Al) satisfying the following conditions: 1-0.8, c: 0.05-0.65
One of CNO layer, or consist of both, and an intermediate adhesion coating layer having an average layer thickness of 0.1 to 10 [mu] m, (c) the composition _{formula: (Zr 1-m M m} ) O n ( however, M Is T
i, V, Nb, and Ta are represented by one or two or more), and the center of the cross section in the thickness direction is measured by an Auger spectrometer. m: 0.01 to 0.1 N: a (Zr, M) O layer satisfying 1.7 to 2.3 with respect to the total amount of Zr and M, and 0.5 to 1
A surface lubricating coating layer having an average layer thickness of 5 μm;
The present invention is characterized in that a coated carbide tool excellent in surface lubricity against chips is obtained by physical vapor deposition of a coating layer composed of (c). Next, the reason why the hard coating layer, the intermediate adhesion coating layer, and the surface lubrication coating layer constituting the coated carbide tool of the present invention are numerically limited as described above will be described. (A) Hard coating layer Al in the (Ti, Al) N layer constituting the hard coating layer
Is to impart excellent high-temperature hardness and heat resistance to TiN having high toughness and to form a solid solution in order to further improve high-temperature wear resistance. Therefore, the composition formula: (T
_{X of} i _1-X Al _X ) N and (Ti _1-X Al _X ) C _{1-Y NY}
If the value is less than 0.1, the desired effect of improving the high-temperature wear resistance cannot be ensured. On the other hand, if the value exceeds 0.7, chipping and chipping are likely to occur on the cutting edge, so that the X value is increased. Is defined as 0.1 to 0.7 (atomic ratio), and the C component in the (Ti, Al) CN layer includes:
(Ti, Al) CN
The layer has a relatively high hardness as compared with the above (Ti, Al) N layer. In this case, when the ratio of the C component is less than 0.01, that is, when the Y value exceeds 0.99, the predetermined hardness is obtained. No improvement effect can be obtained, and on the other hand, when the ratio of the C component exceeds 0.5, that is, when the Y value is less than 0.5, the toughness rapidly decreases. 99, preferably 0.55 to 0.9. On the other hand, if the average layer thickness is less than 0.5 μm, the desired excellent high-temperature wear resistance cannot be ensured. On the other hand, if the average layer thickness exceeds 15 μm, the above-mentioned thickness of the lubricating coating layer may not be obtained. Since chipping and chipping (small chipping) easily occur in the cutting blade,
The average layer thickness was determined to be 0.5 to 15 μm. (C) Intermediate adhesion coating layer (Ti, Al) CO layer and (Ti, Al) CN
Al in the O layer improves high-temperature hardness and heat resistance,
Accordingly, it has a function of improving the adhesion to a hard coating layer containing Al as a common component in addition to forming a solid solution in order to further improve the high-temperature wear resistance. Therefore, the composition formula: (Ti _{1− a} Al _a ) C _1-b O _b and (Ti _1-a A
_{l a) C 1- (b +} c) O b a value of N _c is not obtained the desired improvement in the working is less than 0.1, whereas when the value exceeds 0.7, the cutting edge The value a is set to 0.1 to 0.7 for the reason that chipping or chipping is likely to occur. The (Ti, Al) CO layer and the (Ti, Al)
The O component in the CNO layer has an effect of improving the adhesion to the surface lubricating coating layer, but if the b value in the above composition formula is less than 0.1, the desired effect of improving the adhesion cannot be obtained. Exceeds 0.8, the b value is set to 0.1 to 0.8 for the reason that the strength of the layer itself sharply decreases, which causes chipping or chipping. Further, the (Ti, Al) CNO layer is formed of the (Ti, Al) CO
Although the toughness is relatively high due to the inclusion of the N component as compared to the layer, in this case, if the ratio (c value) of the N component is less than 0.05, a predetermined toughness improving effect cannot be obtained. When the (c value) exceeds 0.65, the hardness of the layer itself rapidly decreases, so the c value is set to 0.05 to 0.65.
It was decided. Further, if the average layer thickness is less than 0.1 μm, it is not possible to ensure strong adhesion between the hard coating layer and the surface lubricating coating layer, while if the average layer thickness exceeds 10 μm, Since the embrittlement of the entire coating layer is promoted, and chipping and chipping easily occur in the cutting edge, the average layer thickness is set to 0.1 to 10 μm. (C) Surface Lubricating Coating Layer The (Zr, M) O layer constituting the surface lubricating coating layer is made of a Zr oxide in which the above-mentioned ratio of the M component is dissolved in a solid solution. The Zr oxide has a very low affinity for work materials, particularly high-viscosity hard-to-cut materials such as stainless steel and mild steel, which is unchanged even in high-speed cutting with high heat generation.
Therefore, the coated carbide tool formed by physical vapor deposition of the Zr oxide layer exhibits excellent surface lubricity, so that chips are not welded to the cutting edge. Chipping does not occur, and excellent cutting performance is exhibited over a long period of time. However, since the Zr oxide layer is brittle and lacks toughness, there is a problem that wear progresses rapidly. . However, M is added to the Zr oxide layer at an atomic ratio of 0.01 to 0.1.
One of the components, Ti, V, Nb, and Ta
When one or more species are contained in a solid solution, (Z
The (r, M) O layer has remarkably excellent surface lubricity equivalent to that of the Zr oxide layer, and also has toughness and strength. As a result, wear resistance is significantly improved.
Therefore, if the ratio (atomic ratio) of M to the total amount with Zr, that is, the value of m is less than 0.01, desired toughness and strength cannot be ensured. On the other hand, if the value of m exceeds 0.1, it is excellent. Since the surface lubricity tends to decrease, the m value is set to 0.01 to 0.1. Also,
The atomic ratio (n) of oxygen (O) in the (Zr, M) O layer
The value of 1.7 to 2.3 means that if the value is less than 1.7, the desired excellent surface lubricating property cannot be ensured. On the other hand, if the value exceeds 2.3, the layer This is because pores are easily formed therein, and it is difficult to stably form a sound surface lubricating coating layer. Furthermore, the same (Z
The reason why the average layer thickness of the (r, M) O layer is 0.5 to 15 μm is that if the average layer thickness is less than 0.5 μm, desired surface lubricity cannot be ensured. The property-imparting action is based on the reason that an average layer thickness of 15 μm can be sufficiently performed. In addition, a TiN layer may be formed on the surface lubricating coating layer by 0.1 to 2 if necessary.
It may be formed with an average layer thickness of μm, since the TiN layer has a golden hue, which makes it easier to distinguish the cutting tool before and after use, in this case If the average layer thickness is less than 0.1 μm, the application of the color tone is insufficient, while the application of the color tone is sufficient if the average layer thickness is up to 2 μm. Next, the coated carbide cutting tool of the present invention will be specifically described with reference to examples. (Example 1) As raw material powders, WC powder, TiC powder, ZrC powder, V
C powder, TaC powder, NbC powder, Cr ₃ C ₂ powder, T
An iN powder, a TaN powder, and a Co powder were prepared, and these raw material powders were blended in the blending composition shown in Table 1, wet-mixed in a ball mill for 72 hours, dried, and then dried.
a into a green compact at the pressure of a
sintering in a vacuum at a temperature of 1400 ° C. for 1 hour, and after sintering, the cutting edge portion is subjected to a honing process of R: 0.05 to form a WC having a chip shape of ISO standard CNMG120408. Substrates A1 to A10 made of base cemented carbide
Was formed. In addition, as raw material powders,
TiCN having an average particle size of 2 μm (by weight ratio TiC /
(TiN = 50/50) powder, Mo ₂ C powder, ZrC powder, NbC powder, TaC powder, WC powder, Co powder, and Ni powder were prepared, and these raw material powders were blended into the composition shown in Table 2. After wet-mixing with a ball mill for 24 hours and drying, the mixture is pressed into a green compact at a pressure of 100 MPa, and the green compact is heated in a nitrogen atmosphere of 2 kPa at a temperature of:
Sintered under the condition of holding at 1500 ° C. for 1 hour, and after sintering, the cutting edge portion is subjected to a honing process of R: 0.03 to obtain a TiC having a chip shape conforming to ISO standard, CNMG120408.
Carbide substrates B1 to B6 made of N-based cermet were formed. Next, these super-hard substrates A1 to A10 and B1 to B6 are ultrasonically cleaned in acetone, dried, and charged into a usual arc ion plating apparatus illustrated in FIG. 1, respectively. On the other hand, as a cathode electrode (evaporation source), Ti-Al alloys having various component compositions are mounted, and the inside of the apparatus is evacuated and kept at a vacuum of 1.3 × 10 ⁻³ Pa while the inside of the apparatus is heated by a heater. After heating to 500 ° C., an Ar gas was introduced into the apparatus to form an Ar atmosphere of 2.5 Pa. In this state, a bias voltage of −800 V was applied to the super hard substrate to clean the surface of the super hard substrate by Ar gas bombardment. Then, while maintaining a vacuum of 3 × 10 ⁻³ Pa,
An arc discharge is generated between the cathode electrode and the anode electrode while the inside of the apparatus is heated to a predetermined temperature within the range of 600 to 700 ° C. by a heater, and methane gas and / or nitrogen are used as reaction gases in the apparatus. A gas is introduced to form a reaction atmosphere at a predetermined pressure, and a bias voltage applied to the cemented carbide substrate is set to -150 V, so that each surface of the cemented carbide substrates A1 to A10 and B1 to B6 is
By forming a hard coating layer having a target composition and a target layer thickness shown in Tables 3 and 4 by vapor deposition, it has a shape shown in a schematic perspective view in FIG. 2A and a schematic longitudinal sectional view in FIG. Conventional surface coated cemented carbide throwaway inserts as conventional coated carbide tools (hereinafter referred to as conventional coated carbide tips) 1
~ 22 were each manufactured. Next, the conventional coated cemented carbide tips 1-2
2 on each surface as a cathode electrode (evaporation source) by the arc ion plating apparatus of FIG.
Ti- with various component compositions for forming an intermediate adhesion coating layer
An Al alloy and a Zr-M alloy having various component compositions for forming a surface lubricating coating layer are mounted, and while the inside of the apparatus is evacuated and maintained at a vacuum of 1.3 × 10 ⁻³ Pa, the apparatus is heated by a heater. With the inside heated to a predetermined temperature within the range of 620 to 720 ° C., the pulse bias voltage applied to the carbide substrate is set to −350 V. Then, oxygen gas, a mixed gas of oxygen gas and methane gas is used as a reaction gas in the apparatus. Alternatively, a mixed gas of oxygen gas, methane gas, and nitrogen gas is introduced to form a reaction atmosphere at a predetermined pressure, and an arc discharge is generated between the cathode electrode and the anode electrode, thereby obtaining a target composition shown in Tables 5 to 7. By forming an intermediate adhesion coating layer and a surface lubricating coating layer having a target layer thickness, the surface-coated cemented carbide of the present invention as the coated carbide tool of the present invention also having the shape shown in FIG. Lore way chip (hereinafter, the present invention refers to the coating hard tip) 1 to 22 were prepared, respectively. The compositions and thicknesses of the various coating layers constituting the various coated carbide tips obtained as a result were measured using an Auger spectrometer and a scanning electron microscope. 7, the composition and the average layer thickness (average values measured at five arbitrary points) were substantially the same as the target composition and the target layer thickness. Next, among the various coated carbide tips obtained as a result, the coated carbide tips 1 to 16 of the present invention and the conventional coated carbide tips 1 to 16 were prepared. Cutting speed: 320 m / min. Infeed: 25 mm Feed: 0.25 mm / rev. , Cutting time: 10 minutes, Dry high-speed continuous high-depth turning test on stainless steel under the following conditions: Work material: JIS SUS304, 4 longitudinally-spaced round bars at equal intervals in the longitudinal direction, Cutting speed: 200 m / min . Infeed: 1.3 mm Feed: 0.5 mm / rev. , Cutting time: 3 minutes, Dry high-speed intermittent high-feed turning test of stainless steel under the following conditions: Work material: JIS S15C, lengthwise round bar with four longitudinal grooves, Cutting speed: 280 m / Min. Infeed: 1.5 mm Feed: 0.55 mm / rev. A dry high-speed intermittent high-feed turning test of mild steel was performed under the following conditions: cutting time: 5 minutes, and the flank wear width of the cutting edge was measured in each turning test. The coated super hard tips 17 to 22 of the present invention and the conventional super hard tips 17 to 22 are as follows: work material: round bar of JIS SUS304, cutting speed: 400 m / min. Infeed: 3.0 mm Feed: 0.3 mm / rev. , Cutting time: 10 minutes, Dry high-speed continuous high-incision turning test of stainless steel under the following conditions: Work material: JIS SUS304, 4 longitudinally spaced round bars with equal length, Cutting speed: 240 m / min . Infeed: 1.8 mm Feed: 0.55 mm / rev. , Cutting time: 3 minutes, Dry high-speed intermittent high-feed turning test of stainless steel under the following conditions: Work material: JIS S15C, 4 longitudinally-spaced round bars at regular intervals in the longitudinal direction, Cutting speed: 340 m / Min. Infeed: 1.5 mm Feed: 0.48 mm / rev. A dry high-speed intermittent high-feed turning test of mild steel was performed under the following conditions: cutting time: 5 minutes, and the flank wear width of the cutting edge was measured in each turning test. Table 8 shows the measurement results. [Table 1] [Table 2] [Table 3] [Table 4] [Table 5] [Table 6] [Table 7] [Table 8] (Example 2) As raw material powder, average particle size:
Medium coarse WC powder having 5.5 μm, fine WC powder of 0.8 μm, TaC powder of 1.3 μm, 1.2 μm
NbC powder, 1.2 μm ZrC powder, 2.3 μm
m Cr ₃ C ₂ powder, 1.5 μm VC powder, 1.0
μm of (Ti, W) C powder and 1.8 μm of Co
Powders were prepared, and each of these raw material powders was blended into the blending composition shown in Table 9, further added with wax, and ball-mixed in acetone for 24 hours, and dried under reduced pressure.
Press molding at a pressure of 0 MPa into various green compacts of a predetermined shape, and pressing these green compacts in a vacuum atmosphere of 6 Pa at 7 ° C. /
The temperature was raised to a predetermined temperature in the range of 1370 to 1470 ° C. at a heating rate of 1 minute, kept at this temperature for 1 hour, and then sintered under the condition of furnace cooling to obtain a sample having a diameter of 8 mm, 13 mm, and 26 mm. Kinds of round bar sintered bodies for forming a cemented carbide substrate are formed, and the above three kinds of round bar sintered bodies are subjected to grinding processing in a combination shown in Table 7 to obtain the diameter × length of the cutting edge portion. Is 6mm × 1 each
3mm, 10mm x 22mm, and 20mm x 45m
Carbide substrates (end mills) a to h each having a square shape and four blades having a size of m were manufactured. Next, these carbide substrates (end mills)
The surfaces a to h were ultrasonically cleaned in acetone, dried, and charged into a normal arc ion plating apparatus also illustrated in FIG. 1 under the same conditions as in Example 1 above. By vapor-depositing and forming a hard coating layer having a target composition and a target layer thickness shown in FIG. 10, the shape shown in the schematic front view in FIG. Conventional surface-coated cemented carbide end mills (hereinafter, referred to as conventional coated carbide end mills) 1 to 8 as conventional coated cemented carbide tools were manufactured. Further, the above-mentioned conventional coated carbide end mill 1
The intermediate adhesion coating layer and the surface lubricating coating layer having the target compositions and target layer thicknesses shown in Tables 11 and 12 were deposited on the surfaces of Nos. 1 to 8 by the same arc ion plating apparatus under the same conditions as in Example 1 above. By forming the same, end mills 1 to 8 made of the surface coated cemented carbide of the present invention (hereinafter referred to as coated carbide end mills of the present invention) as coated carbide tools of the present invention having the shape shown in FIG. . The compositions and thicknesses of the various coating layers constituting the various coated carbide end mills obtained as a result were measured using an Auger spectrometer and a scanning electron microscope. The composition and the average layer thickness (compared with the average value of measurement at five arbitrary positions) were substantially the same as the target compositions and the target layer thicknesses of No. to No. 12. Next, the coated carbide end mill 1 of the present invention will be described.
-8 and the conventional coated carbide end mills 1-8, the coated carbide end mills 1-3 of the present invention and the conventional coated carbide end mills 1-3 are: work material: plane dimension: 100 mm × 250 mm, thickness: 5
JIS SUS304 plate material of 0 mm, Cutting speed: 70 m / min. , Groove depth (cut): 5 mm, Table feed: 120 mm / min, Wet high-speed, high-cut groove processing test (using water-soluble cutting oil) for stainless steel under the conditions:
6 and the conventional coated carbide end mills 4 to 6 are: work material: plane dimension: 100 mm × 250 mm, thickness: 5
0 mm JIS S15C plate, Cutting speed: 78 m / min. , Groove depth (cut): 8.2 mm, table feed: 128 mm / min, dry high-speed, high-cut groove machining test of mild steel, coated carbide end mills 7, 8 according to the present invention and conventional coated carbide end mill 7, About 8, work material: plane dimension: 100 mm x 250 mm, thickness: 5
0 mm JIS SUS304 plate, Cutting speed: 60 m / min. , Groove depth (cut): 9 mm, Table feed: 95 mm / min, Wet stainless steel wet high-speed high-feed groove processing test (using water-soluble cutting oil). The cutting groove length was measured until the flank wear amount of the blade reached 0.1 mm, which is a standard for the service life. The measurement results are shown in Tables 10 and 12, respectively. [Table 9] [Table 10] [Table 11] [Table 12] (Example 3) The diameters of 8 mm (for forming the super-hard substrates a to c), 13 mm (for forming the super-hard substrates d to f), and 26 mm (for the super-hard substrate g) produced in Example 2 described above. h
(For forming), the diameter x length of the groove forming portion was 4 mm x 13 mm (the carbide substrate a ') by grinding from the three types of round rod sintered bodies. ~ C '), 8mm
× 22 mm (carbide substrate d ′ to f ′) and 16 mm ×
Carbide substrates (drills) a 'to h' each having a size of 45 mm (carbide substrates g 'and h') were manufactured. Next, these carbide substrates (drills) a '
Ｈh ′ was ultrasonically cleaned in acetone, dried and charged in a usual arc ion plating apparatus also illustrated in FIG. 1 under the same conditions as in Example 1 above. By evaporating and forming the hard coating layer having the target composition and target layer thickness shown in FIG. 13, the shape shown in the schematic front view in FIG. 4A and the schematic cross-sectional view of the groove forming part in FIG. Drills made of conventional surface-coated cemented carbide as conventional coated carbide tools (hereinafter referred to as conventional coated carbide drills)
8 were each produced. Further, the above-mentioned conventional coated carbide drills 1 to 8
The intermediate adhesion coating layer and the surface lubrication coating layer having the target compositions and the target layer thicknesses shown in Tables 14 and 15 are formed by vapor deposition on the surface of the substrate under the same conditions as in Example 1 by the same arc ion plating apparatus. Accordingly, drills made of the surface-coated cemented carbide of the present invention (hereinafter, referred to as coated carbide drills of the present invention) 1 to 8 as the coated carbide tools of the present invention also having the shape shown in FIG. 4 were manufactured. Further, with respect to the various coated carbide drills obtained as a result, the compositions and thicknesses of various coating layers constituting the drills were measured using an Auger spectrometer and a scanning electron microscope. The composition and the average layer thickness (compared to the average value of measurement at five arbitrary points) were substantially the same as the target composition and the target layer thickness of No. to No. 15. Next, the above-mentioned coated carbide drills 1-8 of the present invention are coated.
Of the coated carbide drills 1 to 8 of the present invention, the coated carbide drills 1 to 3 and the coated carbide drills 1 to 3 of the present invention are as follows: Work material: plane dimension: 100 mm × 250 thickness: 50 mm
JIS SUS304 plate material, rotational speed: 4000 min ^-1 , feed: 0.25 mm / rev, wet high-speed high-feed drilling test of stainless steel under the conditions, coated carbide drills of the present invention 4 to 6 and conventional coated carbide For drills 4 to 6, Work material: Plane dimensions: 100 mm x 250 mm, Thickness: 5
0 mm JIS SUS304 plate, rotating speed: 2200 min ^-1 , feed: 0.38 mm / rev, wet wet high-speed high-drilling test of stainless steel, coated carbide drills 7, 8 according to the present invention and conventional coated For carbide drills 7 and 8, Work material: Plane dimensions: 100 mm x 250 mm, thickness: 5
JIS S15C plate material of 0 mm, rotational speed: 2400 min ^-1 , feed: 0.55 mm / rev, and wet high-speed high-feed drilling test of mild steel were performed. Flank wear width of the tip cutting edge is 0.3m
The number of drilling operations up to m was measured. The measurement results are shown in Tables 13 and 15, respectively. [Table 13] [Table 14] [Table 15] From the results shown in Tables 3 to 15, all of the coated carbide cutting tools of the present invention have excellent lubrication on the cutting edge surface by the (Zr, M) O layer as the surface lubricating coating layer. , Which constitutes the intermediate adhesion coating layer (Ti, A
1) firmly adheres to the CO layer and the (Ti, Al) CNO layer, while the intermediate adhesion coating layer is in contact with the (Ti, Al) N layer and the (Ti, Al) CN layer constituting the hard coating layer. Since it comes to adhere firmly, even when cutting stainless steel and mild steel at high speed with high heat generation, and under heavy cutting conditions such as high cutting and high feed, the chips heated to high temperature are Without welding to the (Zr, M) O layer,
Since the cutting edge always maintains excellent surface lubricity, chipping due to chip welding to the cutting edge does not occur on the cutting edge, and the cutting edge exhibits excellent wear resistance. In the conventional coated cemented carbide tool having no (Zr, M) O layer, the chips tend to adhere to the hard coating layers (Ti, Al) N layer and (Ti, Al) CN layer. Since the hard coating layer is locally peeled off, it is clear that chipping occurs in the cutting blade and the service life is relatively short. As described above, the coated cemented carbide tool of the present invention can be used not only for cutting under various conditions such as steel and cast iron, but also for stainless steel, which is particularly highly viscous and easily adheres to the cutting blade surface. Even when high-speed cutting of steel or mild steel is performed under heavy cutting conditions such as high depth of cut and high feed, it exhibits excellent surface lubricity against chips and exhibits versatile cutting performance. It is possible to satisfactorily cope with the FA of the processing device, the labor saving and the energy saving of the cutting process, and the cost reduction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory view of an arc ion plating apparatus. FIG. 2A is a schematic perspective view of a coated carbide tip, and FIG.
1 is a schematic vertical sectional view of a coated carbide tip. FIG. 3 (a) is a schematic front view of a coated carbide end mill,
(B) is a schematic transverse sectional view of the cutting blade portion. FIG. 4A is a schematic front view of a coated carbide drill, and FIG.
FIG. 3 is a schematic cross-sectional view of the groove forming portion.

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[Procedure amendment] [Date of submission] August 22, 2001 (2001.8.2
2) [Procedure amendment 1] [Document name to be amended] Specification [Item name to be amended] 0017 [Correction method] Change [Content of amendment] Next, among the various coated carbide tips obtained as a result, Worked material: JIS SUS304 round bar, Cutting speed: 320 m / min. , Notch: 2.5 mm , feed: 0.25 mm / rev. , Cutting time: 10 minutes, Dry high-speed continuous high-depth turning test of stainless steel under the following conditions: Work material: JIS · SUS304 round bar with four longitudinal grooves at regular intervals in the longitudinal direction, Cutting speed: 200 m / min . Infeed: 1.3 mm Feed: 0.5 mm / rev. , Cutting time: 3 minutes, Dry high-speed intermittent high-feed turning test of stainless steel under the following conditions: Work material: JIS S15C, lengthwise round bar with four longitudinal grooves, Cutting speed: 280 m / Min. Infeed: 1.5 mm Feed: 0.55 mm / rev. A dry high-speed intermittent high-feed turning test of mild steel was performed under the following conditions: cutting time: 5 minutes, and the flank wear width of the cutting edge was measured in each turning test.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C23C 14/32 C23C 14/32 F (72) Inventor Yusuke Tanaka 179 Kanegasaki Nishi-Oike, Uozumi-cho, Akashi-shi, Hyogo Prefecture 1 FMC Term Co., Ltd. F term (reference) 3C037 CC02 CC04 CC11 3C046 FF03 FF05 FF10 FF17 FF19 FF25 4K029 AA04 BA41 BA54 BA58 BB02 BC02 BD05 CA03 DD06 EA01

Claims (1)

Claims: 1. A surface of a tool base composed of a tungsten carbide-based cemented carbide or a titanium carbonitride-based cermet, wherein (a) a composition formula: (Ti _1-X Al _X ) N (Ti _1-X
Al _x ) C _{1 -Y} N _Y , where the center of the cross section in the thickness direction was measured with an Auger spectrometer, and the following were all expressed in atomic ratios: X: 0.1 to 0.7; A composite nitride layer of Ti and Al satisfying 0.5 to 0.99, and Ti and Al
Any of a composite carbonitride layer, or consist of both, and a hard coating layer having an average layer thickness of 0.5 to 15 m, (b) the composition _{formula: (Ti 1-a Al a} ) C 1- _{b Ob} and the same (T
i _1-a Al _a ) C _{1- (b + c)} O _b N _c , when measured at the center of the cross section in the thickness direction with an Auger spectrometer, a: 0.1 to 0.7; b: 0.1 to 0.8, c: 0.05 to 0.65, from one or more of the Ti and Al composite carbonate layers and composite carbonitride layers. It becomes, and the intermediate adhesion coating layer having an average layer thickness of 0.1 to 10 [mu] m, (c) the composition _{formula: (Zr 1-m M m} ) O n ( however, M is T
i, V, Nb, and Ta, or one or more of Ta)), and the center of the cross section in the thickness direction is measured by an Auger spectroscopic analyzer. 1, n: a composite oxide layer of Zr and M satisfying 1.7 to 2.3;
Surface lubricating coating layer having an average layer thickness of 5 to 15 μm, and a surface-coated cemented carbide cutting tool having excellent surface lubricating properties against chips, obtained by physical vapor deposition of the coating layer comprising (a) to (c) above. .